JP6298090B2 - Manufacturing method of friction body - Google Patents

Description

The present invention relates to a friction body manufacturing method and a thermochromic writing instrument.

Conventionally, in Patent Document 1, a thermochromic handwriting or image formed on a paper surface is rubbed using a thermochromic ink, and the thermochromic handwriting or image is thermally discolored by frictional heat generated at that time. A friction body is described. Patent Document 1 describes a thermochromic writing instrument that contains thermochromic ink inside and has the friction body on the outer surface.

In the friction body of Patent Document 1, when the thermochromic handwriting or image is thermally discolored using the friction body, the opposite side cannot be visually recognized from the viewing side of the friction body, and the thermochromic handwriting or image is more than necessary. Tend to discolor. In other words, it is difficult for the frictional body of Patent Document 1 to surely thermally discolor only the portion of the thermochromic handwriting or image where it is desired to be discolored.

JP 2009-66780 A

The present invention solves the above-mentioned conventional problems, and includes a method for manufacturing a friction body capable of surely changing the color of a thermochromic handwriting or an image of a portion where an image is desired to be changed. An object is to provide a thermochromic writing instrument.

A first invention of the present application rubs a thermochromic image or handwriting formed on a writing surface using a thermochromic ink, and heats the thermochromic image or handwriting with frictional heat generated at that time. A method of producing a discolorable friction body, wherein the friction body rubs a thermochromic image or handwriting on a writing surface, and is transparent on the side surface through which the opposite side of the side surface can be seen. The see-through part 22 made of a translucent material is provided, and the friction body comprises a friction part made of an elastic material provided on the top outer surface of the see-through part. The see-through part and the friction part are formed by two-color molding. It is required to be fixed.

The friction body 1 obtained from the first aspect of the invention can be seen through the side of the friction body 1 from the side opposite to the side when the thermochromic image or handwriting on the writing surface is rubbed. By providing the portion 22, it is possible to surely change the color of only the portion of the thermochromic handwriting or image where the color change is desired.

In the friction body 1 obtained from the first invention, the see-through portion 22 is made of a transparent or semi-transparent material, so that the friction member 1 wobbles during friction as compared with the case where the see-through portion 22 is configured by a through hole. Can be prevented. Examples of the transparent or translucent material include transparent or translucent synthetic resin, transparent or translucent rubber, or elastomer.

The friction body 1 obtained from the first invention is provided with a friction part 32 made of an elastic material on the outer surface of the top of the see-through part 22 (the see-through part 22 made of a transparent or translucent material). The see-through part 22 having a function and the friction part 32 having an appropriate friction function can be reliably obtained.

In the friction part 32 obtained from the first invention, the see-through part 22 and the friction part 32 are firmly fixed by fixing the see-through part 22 and the friction part 32 by two-color molding.

The second invention of the present application contains a thermochromic ink inside, has a nib 6 capable of discharging the thermochromic ink at one end, and uses the thermochromic ink on the outer surface on the writing surface. A thermochromic writing instrument comprising a frictional body 1 capable of rubbing the formed thermochromic handwriting and heat-discoloring the handwriting with frictional heat generated at that time, wherein the frictional body 1 is that of the first invention. It must be obtained from the manufacturing method.

The thermochromic writing instrument 4 of the second invention is provided with the friction body 1 obtained from the manufacturing method of the first invention, so that only the portion of the thermochromic handwriting or image that is desired to be thermochromic is surely changed. Can be discolored by heat.

In the present invention, the elastic material constituting the friction part 32 includes an elastic synthetic resin (rubber, elastomer), such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS. Examples include resins (styrene-ethylene-butylene-styrene copolymers), fluorine resins, chloroprene resins, nitrile resins, polyester resins, olefin resins, ethylene propylene diene rubber (EPDM), and the like.

The elastic material is preferably made of a low-abrasion elastic material that hardly generates wear debris during friction rather than a high-abrasion elastic material (for example, an eraser).

In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that is decolored by heating from a colored state, a color memory retaining type that reversibly stores a colored state or a decolored state in a specific temperature range, or from a decolored state. Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

In the present invention, as shown in FIG. 8, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path from the case of lowering, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory-holding type thermochromic ink that can store and hold in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase holding temperature range)]. In FIG. 8, ΔH represents a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

The substantial two-phase holding temperature range can be set according to the purpose, but in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is 25 ° C. to 95 ° C. (preferably 36 ° C. ˜90 ° C.), and the low temperature side discoloration point [complete color development temperature (t ₁ )] may be set in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). It is valid. Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction body 1.

The friction body obtained from the present invention can be surely thermally discolored only in a portion where it is desired to discolor the thermochromic handwriting or image.

The thermochromic writing instrument of the present invention can surely thermally discolor only the portion of the thermochromic handwriting or image that is desired to be thermally discolored.

It is a partially cutaway longitudinal cross-sectional view of an embodiment of a thermochromic writing instrument provided with a friction body obtained from the present invention. It is a principal part expanded longitudinal cross-sectional view of FIG. However, the friction body is a front view. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a front view which shows embodiment of the friction body of this invention. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

Embodiments of the friction body 1 and the thermochromic writing instrument 4 obtained from the present invention are shown in FIGS.

The thermochromic writing instrument 4 includes a shaft cylinder 5 containing a thermochromic ink therein, a pen tip attached to one end of the shaft cylinder 5 and capable of discharging the thermochromic ink in the shaft cylinder 5. 6 (for example, a pen tip such as a ballpoint pen, a marking pen, and a sign pen) and a friction body 1 attached to the other end of the shaft cylinder 5.

The friction body 1 includes an inner member 2 made of a transparent or translucent synthetic resin (for example, polycarbonate resin) and an elastic material (for example, SEBS resin, SBS resin, and the like) fixed so as to cover the outer peripheral surface of the inner member 2. And an outer member 3 made of silicone resin or the like. The inner member 2 and the outer member 3 are integrally fixed by two-color molding.

The inner member 2 includes a cylindrical core portion 21 and a see-through portion 22 having a flat plate shape (a plate shape having flat portions on both side surfaces). The outer member 3 includes a cylindrical attachment portion 31 that concentrically covers the columnar core portion 21 and a friction portion 32 that surrounds the flat plate-like see-through portion 22 in a frame shape. That is, the see-through portion 22 is made of a transparent or translucent synthetic resin (for example, polycarbonate resin), and the friction portion 32 is made of an elastic material.

The friction part 32 and the see-through part 22 of the friction body 1 project outside from the end of the shaft cylinder 5 on the side opposite to the pen tip, and the mounting portion 31 of the friction body 1 It is attached to the attachment hole 51.

An outward projection 31 a is formed on the outer surface of the attachment portion 31. A mounting hole 51 is formed at the end of the shaft cylinder 5 opposite to the pen tip. An inward projection 51 a is provided on the inner surface of the mounting hole 51. The attachment portion 31 of the friction body 1 is inserted into the attachment hole 51 of the shaft cylinder 5, and the outward projection 31 a on the outer surface of the attachment portion 31 and the inward projection 51 a on the inner surface of the attachment hole 51 are moved over and engaged. As a result, the friction body 1 is attached to the end of the shaft cylinder 5 opposite to the pen tip side.

The friction body 1 of the present embodiment and the thermochromic writing instrument 4 of the present embodiment, when rubbing the thermochromic image or handwriting on the writing surface, are opposed to the side surface of the friction body 1 from the side surface to the opposite side surface. By providing the see-through portion 22 that can be seen through the side, it is possible to surely change the color of only the portion of the thermochromic handwriting or image that is desired to be changed in color.

The friction body 1 and the thermochromic writing instrument 4 according to the present embodiment are configured such that the see-through portion 22 is made of a transparent or semi-transparent material, so that the friction body during friction is compared to the case where the see-through portion 22 is configured by a through-hole. The wobble of 1 can be prevented.

The friction body 1 and the thermochromic writing instrument 4 of the present embodiment are provided with the friction portion 32 made of an elastic material on the top outer surface of the see-through portion 22 (the see-through portion 22 made of a transparent or translucent material). The see-through part 22 having an appropriate see-through function and the friction part 32 having an appropriate friction function can be reliably obtained. In addition, since the friction body 1 and the thermochromic writing instrument 4 of the present embodiment are configured such that the friction part 32 made of an elastic material surrounds the flat part of the see-through part 22 in a frame shape, the friction part 32 and the see-through part 22 Can be firmly fixed, and the periphery of the see-through portion 22 can be protected.

In the friction body 1 and the thermochromic writing instrument 4 of the present embodiment, the see-through portion 22 and the friction portion 32 are firmly fixed by fixing the see-through portion 22 and the friction portion 32 by two-color molding. The

In the friction body 1 and the thermochromic writing instrument 4 according to the present embodiment, since the see-through portion 22 has a plate shape with flat portions on both side surfaces, the opposite side of the friction body 1 can be easily passed through the see-through portion 22. It can be visually recognized.

DESCRIPTION OF SYMBOLS 1 Friction body 2 Inner member 21 Core part 22 See-through part 3 External material 31 Attachment part 31a Outward protrusion 32 Friction part 4 Thermochromic writing instrument 5 Shaft cylinder 51 Attachment hole 51a Inward protrusion 6 Pen tip

Claims (1)

A method for producing a friction body capable of rubbing a thermochromic image or handwriting formed on a writing surface using a thermochromic ink and thermally discoloring the thermochromic image or handwriting by frictional heat generated at that time When the friction body rubs a thermochromic image or handwriting on the writing surface, a transparent portion made of a transparent or translucent material that can be seen through from the side surface to the opposite side of the side surface And the friction body includes a friction portion made of an elastic material provided on the outer surface of the top portion of the see-through portion, and the see-through portion and the friction portion are fixed by two-color molding.

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